Respostas

2013-06-13T20:40:58-03:00

X= 12

 

12² - 12x12=0

144-144=0

0=0

2013-06-13T20:45:24-03:00

x² - 12x = 0

x (x - 12) = 0

 

x' = 0

 

ou

 

x'' - 12 = 0

x'' = 12

 

R:  x = 0 ou x = 12